statement-builder-oo-design's Introduction

Object Oriented Framework To Parse and evaluate expressions

Statements Identification

@Test
	public void names() {
		String raw = "SOFTWARE_COST >= 23 AND INFRA_COST <= 900 and TOTAL_COST IN 500,500,700";
		Statements statements = new Statements(raw);

		assertThat(statements.containsNStatements(3), equalTo(true));
		assertThat(statements.getNames().contains("SOFTWARE_COST"), equalTo(true));
		assertThat(statements.getNames().contains("INFRA_COST"), equalTo(true));
		assertThat(statements.getNames().contains("TOTAL_COST"), equalTo(true));
		
	}

Statements Evaluation

Equals Expression

@Test
	public void shouldAssertTrueForEqualValue() {
		String raw = "Asabasef == 2 ";
		Statements statements = new Statements(raw);
		EqualsExpression expression = new EqualsExpression(null);
		assertThat(expression.evaluate(statements, 0, NameValue.ofDefault("2")), equalTo(true));
	}

In Expression

	@Test
	public void shouldAssertFalseForOutValue() {
		String raw = "INFRA_COST IN 4,6,7 ";
		Statements statements = new Statements(raw);
		Expression expression = new StringInExpression(null);
		assertThat(expression.evaluate(statements, 0, NameValue.ofDefault("2")), equalTo(false));
	}

Composite Expression


	@Test
	public void shouldAssertTrueForEqualValue() {
		String raw = "SOFTWARE_COST >= 23 AND INFRA_COST <= 900 and CITY IN ABC,XYZ,PQR";
		Statements statements = new Statements(raw);
		Expression expression = new CompositeExpression();
		assertThat(expression.evaluate(statements, 0, nameValue("25", "800", "ABC")), equalTo(true));
	}
	
	@Test
	public void shouldAssertFalseIfFirstParamDoesNotMatch() {
		String raw = "SOFTWARE_COST >= 23 AND INFRA_COST <= 900 and CITY IN ABC,XYZ,PQR";
		Statements statements = new Statements(raw);
		Expression expression = new CompositeExpression();
		assertThat(expression.evaluate(statements, 0, nameValue("20", "800", "ABC")), equalTo(false));
	}

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